Contract Acquisition Costs and Intangible Asset - Other (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Contract Acquisition Costs and Intangible Asset
Contract acquisition costs, amortization expense	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Intangible asset, amortization expense		$ 0.1	$ 0.1	$ 0.1

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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+ Details